| Nurse practitioner | 187 |
| Certified Registered Nurse Anesthetist (CRNA) | 61 |
| Physician assistant | 49 |
| Family practice | 46 |
| Physical therapist (private practice) | 44 |
| Internal medicine | 43 |
| Chiropractic | 33 |
| Emergency medicine | 32 |
| Licensed clinical social worker | 32 |
| Mental Health Counselors | 23 |
| Diagnostic Radiology | 23 |
| Optometrist | 19 |
| Clinical psychologist | 16 |
| Anesthesiology | 15 |
| Obstetrics/gynecology | 14 |
| Mass Immunization Roster Billers | 13 |
| Ambulance Service Supplier, e.g., private ambulance companies, funeral homes | 12 |
| Hospitalist | 12 |
| Cardiology | 12 |
| Podiatry | 11 |
| Occupational therapist (private practice) | 11 |
| Gastroenterology | 10 |
| General surgery | 10 |
| Audiologist (billing independently) | 10 |
| Orthopedic surgery | 10 |
| Psychiatry | 8 |
| Speech / language pathology | 8 |
| Urology | 7 |
| Hematology/oncology | 7 |
| Dermatology | 7 |
| Pathology | 6 |
| Neurology | 6 |
| Ambulatory Surgical Center | 6 |
| Interventional Cardiology | 6 |
| Ophthalmology | 6 |
| Certified clinical nurse specialist | 6 |
| Neurosurgery | 6 |
| Otolaryngology | 6 |
| Nephrology | 5 |
| Oral surgery (dentists only) | 5 |
| Centralized Flu | 5 |
| Endocrinology | 5 |
| Plastic and reconstructive surgery | 4 |
| Pulmonary disease | 4 |
| Radiation oncology | 3 |
| Pain Management | 3 |
| Infectious disease | 3 |
| Thoracic surgery | 3 |
| Pediatric medicine | 3 |
| Physical medicine and rehabilitation | 3 |
| Registered Dietician/Nutrition Professional | 2 |
| Colorectal surgery (formerly proctology) | 2 |
| Critical care (intensivists) | 1 |
| Clinical Laboratory (Billing Independently) | 1 |
| Certified nurse midwife | 1 |
| Interventional Pain Management (IPM) | 1 |
| Sports Medicine | 1 |
| Pharmacy | 1 |
| Cardiac surgery | 1 |
| Preventive medicine | 1 |
| Single or Multispecialty Clinic or Group Practice | 1 |
| Allergy/immunology | 1 |
| Cardiac Electrophysiology | 1 |
| Rheumatology | 1 |